Tack-making machine.



J. H. REED.

TACK MAKING MACHINE.

APPLICATION FILED OCT. 18. 1911.

Patented July 9, 1918.

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J. H. REED.

TACK MAKING MACHINE.

APPLICATION FILED ocr. 18.19171 Patented July 9, 1918.

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TACK MAKING MACHINE.

APPLICATION FILED OCT. 16, 1917.

Patented July 9, 1918.

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. E ST 2 JAMES H. REED, 0 F SWAMPSGOTT, MASSACHUSETTS.

anon-MAKING MACHINE.

Specification of Letters Patent.

Patented July 9, 1918.

Application filed October .18, 1917. Serial No. 1 7, 67.

'useful Improvement in Tack-Making Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention has for its object a new and improved machine'for the manufacture of tacks from strips of sheet metal. The tacks made by my improved machine are the ordinary tack employed in the manufac ture of shoes, in upholstery and for like purposes and consists of a shank having a cut point, a round head at the other end, the shank itselfbeing substantially cylindrical or slightly frusto-conical adjacent the head. A machine embodying my invention comprises essentially mechanism for advancing a strip of material step by step to a punch; a punch which cuts suitable wedge shape slugs or blanks from the end of the strip, the points and butts alternating in position; a pair of dies which round the portion of the blank adjacent the point where the head is formed, and suitable mechanism for forming the head on the tack. The position of the punch is changed after each stroke thereby cutting blanks the points and butts of which alternate in position. This construction does away with-the complicated machinery heretofore employed in tack maklng machines by which the strip from which the blanks are cut is turned bottomside up after each stroke of the punch. In

the machine embodying my invention, the

punch delivers the slug directly to the die which forms the rounded portion of the shank and by which in cooperation with a head forming hammer forms the head of the tack. The die is so constructed that the head'is always formed on the butt of the slug there being two head forming hammers one on each side of the machine. The dies and head forming hammers operate to producera tack, the head of which is round and true and does not need to be trimmed so that my machine does-away entirely with the expensive operation of trimming the heads of the tacks after they have been formed for which purpose an expensive, delicate and complicated machine has here tofore been employed.

The machine embodying my invention is simple and inexpensive and capable of being run at high speed. It forms a finished tack directly from the strip of material at a minimum of expense.

The invention will be fully understood 4 when taken in connection with the following description and the accompanying drawings and the novel features thereof will be pointed out and clearly defined in the claims at the close of this specification.

In the drawings, Figure 1 is an elevation partly in section of a machine embodying my invention.

Fig. 2 is a section on line 2-2 of Fig. 1.

Fig. 3 is a section on line 33 of Fig. 2.

Figs. 4 and 5 are sections of the central portion of the machine showing the work ing instrumentalities in successive positions.

Fig. 6 is a detail showing the head forming hammers in another position.

Fig. 7 is a plan view showing in detail the formation of the head of the tack by the cooperating dies and head forming hammer.

Fig. 8 is a section on line S8 of Fig. 1.

Fig. 9 is an enlarged view of the face of the die 50.

Fig. 10 is a plan View of the strip showing how successive slugs or blanks are cut therefrom.

Fig. 11 is a plan view of a slug or blank cut by the punch and from which a tack is to be made.

Fig. 12 is a View of the finished tack on an enlarged scale.

Referring now to the drawings and particularly to Fig. 12, there is shown therein tively wide butt. At 6 in Fig. 10 is shown ap'ortion of a strip of material from which the blanks cl are cut. Four successive cuts are indicated by dotted lines 7 in Fig. 10. It will be seen that they are at an angle to the sides of the strip so'that the points and butts of the slugs alternate in position.

At 11 is shown the bed plateor table of chine.

40 "of the ;machine.

the machine. Beneath this table is supported a main shaft 512 having -'thereonisuitable cams and gears to produce the requisite movements of the Working part-s'of the ma- 7 I I At 6 is shown the strip of material which is fi'fed by'a suitable guide 14-. to the punch 15. The feeding of the strip step by step for exactly the right distance is accomplished by a roll feed consisting of a pairofsknurled'feed rolls 16and1 7 mounted respectively above and below the strip 0. Said .feed rolls are. geared together by gears one of which 18 is shownin .Fig. 2. The axle .19 of the lower roll .is'pro-vided with an arm.20 loosely.mountedfrhereon andcontaining a roll 21 and spring22 which .to- -gether with {the hub =27 constitutes a .roll clutch sothat the oscillating movement of the arm 2O gives the feed rolls a step by step motion in one direction only. 'The arm 20 is formed in twopartsand is adjustable in length by means of the bolt23. This adjustment varies the lengthbf-the feed of the strip and -consequently-pthe width of [the 25 slug which'wi-ll be produced. The arm 20 is oscillated .by- 'a lin-k2t on one end of :Which is mounted a roll .25 which moves in a slot 26 in a :cam on the i'main shaft 12 of the machine. .The upper'feed lOll 16 :is

mounted in an arm 28 which is downwardly zpressed by a 'spring'29 so that-the :feed rolls will exert the necessary pressureionthe-strip .6 ti feed it forward accurately.

hepu-nch .15 is' mounted at the lowerzend of asquare slide 30 itself carried tin an oscillatingframe 31. This oscillating-shame 131 has; a-cylindricalbOSs or "bearing '9 formed on the bottom which is received within a corresponding circular hole in ithe bed 11 The frame :31 also comprises a pair of side extensionsivwhich ras will be hereinafter described carry. the head forming hammers and a rearward extension i by imeans of which the frame 31 .oscil- :lated. The oscillation of the @frame is produced'by a cam '32 which :is-cut'or formed in such a :manner Ithat the oscillating .frame will remain substantially z-stationary at the end ofSeach half oscillation :to give'the punch 15 an opportunity to perform its function while the -oscillating frame 31 is stationary. The upperlen'd' :of the square slide 30 is cylindrical in :shape as shown at .3etiwith ;a

rgroove-35 therein. llhe (cylindrical end 3 1 extends up into a hole in thezunder side :of ahead 36 ;and is secured Ithereto @brypins 37 (see Figs. 1::and 3;) wlhichilie'tangentially in the groove 35. vThis .constructi on permits the square shaft 30 carrying thepunch :15 to :oscillatewiththe oscillatingframe 31 while the ,head36 which actuates the punch remains zstationary. The head 586 contains a cam ggroove3'8 in whichimoves airoll 39 :lo-

cated accent-rically. on a shaft 40 icarried fin a stationary rbracket 41011 the upper "part of the "machine. The rear end of the shaft =:40:is-.;provided with abeveled gear 42 meshing with a large bevel gear 13 ona vertical shafte't the lower end of which is provided "with a bevel gear 15 engaged by another bevel'ed"gear-46 on the main sh a ft'i12' of the cooperates with the edge of I Directly beneath .thestrip ,is located a' v finger 48 havingin thetopthereof a notch v j for engagement with the-slug. The finger'LS is'on the upper end of axed-90 guided in a hole intheboss gonthe frame ofthe. ma-' The lower end-of ?the rod 90 is .L-'

chine. shaped and is 'formed into a member .5010- cated in-one end of arlever=52 pivotediat 53 .to a dependingbracket-Mon the under side of the tab'le 11. The rear end iof thelever .52vcarries a cam troll 5l located in a cam slot 55 in the sideof a iplatecam 56. This plate cam 56 is'mounted on thezmain shaft 12 of the machine-and-the cam groove is so devised that the finger 18 will be in its high- .est .position just before the bottom of the i stroke of the punch '15 and the punch "will ,push the slug down into the notch j .in-the .upper 'end of-the finger 48. .Theicamis also arranged so that thereafter ,the punch and ,finger willymove downward in umison ca'r- I irying the slug :between them to a predeterr mined point. The successive .positions .-of ithe punch 15 and finger- 18 will be-clearly seen from' Figs. 1,41 and=-5.

Theaiies by whichzthej slugis formed .into 1 .a tack iconsist 10f a reciprocating die '50 and a.stationary.die'51.' Y

In the proximate vertical iface's of these two dies, Where are formed suitable matrices for the formation :of the shankgand headidf the tack. The-form of one'of these matrices may be seen in ,Fig. 59. It consists of :a semi-cylindrical :portion 7? and an enlarged semi-cylindrical portion 'l on eone end and on the other :end inw'hich the :diskshaped heads of successive tacks are formed. .It will be understood :of course that the ihea'd's of successive tacks are 'lfonmedalternately by the matrices Z and respectively. @r

to state this matter'in another way, tack is lfiL'St formed with its head at the right as shown in Fig. 9 and the next tack is formed with 11138 1182111 at the left. v

Ztn the vertical face of the movable [die member 50, is located a' spring pin- 57 having a notched end to engage the slug. Be- 130 hind the .pin is a spring 58 whichallows the pin to yield and be pushed'back into the pocket in the movable die '50. The function of the spring pin 57 is to seize the slug when it has been moved down vertically to a point on alevel with the matrices .(see Fig. 4) and to push it into the matrix in the stationary die 51'holding it there until the punch 15 is lifted and the finger 48has been withdrawn so that the two dies can come to- ,gether. The movable die 50 is, actuated by a toggle joint 60 pivoted at one end to the movable die and at the other end to the oscillating frame asshown at 61. The toggle joint is straightened by a vertical rod 62 carrying on its upper end a cam roll 63 located in a cam groove in the face of a plate cam 64. The. minute amount of play necessary owing to the fact that the upper end of the cam rod .62 cotiperates with the cam 64 on the stationary bracket. 41 while the lower end cooperates with the toggle joint 60 carried. on the. oscillating frame '31 isnot sufiicientto interfere with the operation of the parts. The toggle joint 60 pushes the movable die 50 against the face of the. stationary die 51 at the proper time with sufficient force to. form the cylindricalportion on-the shank of the tack. The dies remain in closed'position .for a sufiicient length of timeto permit the inward movement of'ionezor the other of the headforming hammers'by which the end of the shank is compressed into the portion Z and m of the matrix to form the disk shaped head. The head forming hammers will clearly be seen at 65 and 66 in Figs. 2, 3, 6 and 7. Each head forming'hammer has a cylindrical projection n of the size of the head of the tack. The other end of the hammer is connected to a toggle 67 one end of which is connected at 68 to lugs in the frame of the machine. The toggle is actuated by a link 69 the lower end of which is connected by a universal joint 70 to a pivoted lever 71. This lever 71 carries on its rear end a cam roll 72 operating in a cam slot 73 in the face of a plate cam 74. Both hammers 65 and 66 have similar operating mechanism and therefore-only one of them has been described, the same numbers applying to similar parts of both mechanisms.

The two cams 74 which operate the hammers 65 and 66 are so set on the main shaft 12 of the machine that the hammers are operated alternately, that is to say, while one hammer is in forming the head of a tack, the other hammer is withdrawn as far as possible (see Fig. 7 so that it will not interfere with the point of the tack which is then being formed.

In the operation of my machine, the strip of sheet material which may, if preferred, be in the form of a coil, is fed step by step between the punch and block. The punch descends, cuttingoif a triangular slug which is deposited by the punch. in the notch in the upper end of the finger 48. Thereafter, the punch 15 and the finger 48 descends together, carrying the. slug with them, until a point opposite the matrix in the die 51 is reached. Thedie 50. then advances until the spring finger 57 strikes the slug and pushes it into the matrix in the die 51 holding it there. .The. punch and finger then withdraw and a further movemen of the die 50 compresses the tack into the cylindrical portion of the matrix. When the dies 50 and 51 are fully closed, one of the head forming hammers 65 or 66 moves inwardly and in cooperation with the enlarged portion of the matrix, forms the head of the tack, the tack being held meanwhile by the pressure exerted by the die 50. The oscillating frame 31 then swings about the boss g, thus changing the position of the punch 15 and block 4-7 relatively to the end of the strip so that on the next downward movement of the punch, a slugwill be cut,-the

point of which lies in the opposite direction from the preceding slug. I The tack is formed from this slug in the same manner as already described, except that the formation of the head is accomplished by the other of the head forming hammers 65 and 66.

What I claim is: r

1. In a machine of the character described, a frame, a punch and block oscillatable relatively to said frame, means for oscillating the punch and block, means carried by the frame to reciprocate the punch there being a loose connection between the punch and its reciprocating means to permit the said oscillation.

2. In a machine of the character described, a stationary frame, an oscillatable frame, a punch and block and head forming mechanism mounted in said oscillatable frame, stationary strip feeding mechanism, means for reciprocating-the punch, and means for oscillating said oscillatable frame between successive reciprocations of the punch.

3. In a machine of the character described, a stationary frame having an overhanging bracket, an oscillatable frame supported on said stationary frame, a punch and block mounted on said oscillatable frame, actuating means for the said punch in the bracket of the said stationary frame, oscillating means for the oscillatable frame, there being a loose connection between said punch and the reciprocating means therefor to permit said oscillation.

4. In a machine of the character described, strip feeding mechanism, a reciprocating punch and tack forming dies movable relatively to each other, and so located as to permit the punch to deposit a slug in the said dies.

5. In a machine of the character described,

Lama-e the combination With a shearing punch-and block, tack 'formlng dies, means for movlng said-dies relatively to each other,'an'd a 'finger cooperating With the said pun'ch =to dei-p'osit a slug cut by the said punch between the 'saiddies.

6. In a machine ofthe character described, the combination With a shearing punch and block, a pair of tackformingdies, movable toward and away :from each other, and a spring finger in the face of one of said-dies to hold a slug cut by the punch 'in proper 1 position relatively to't'he' other die.

7, Ina machine of the ch aracter described, the combination With ashearing punch and block, step by step strip feeding mechanism, :ta'ck forming mechanism including dies and a head formin g hammer reciprocating lengthwise of the tack "to .be formed, and "means for oscillating the punch and "block and the 'tack forming mechanism as a whole relatively-to the feeding mechanism between successive strokes of the punch. a

8. In a-machine-of the character'described, a stationary frame, an oscillatable' frame mounted on said stationary frame, a punch and "block carried by said oscillatable frame, tack forming diesand head'forming hammers mounted'on said oscillatable frame, :stationary strip feeding mechanism, means for reciprocating said punch, and means for-'oscillating said oscillatable frame betWeen reciprocations of the punch.

9. In a machine of the character described,

:step by stepstrip feeding mechanism, a reciprocating punch and :block, tackforming dies, one of which is capable of reciprocation 'relatively to-the other, the matrices of which are constructed to permit the fofrmation o'f successive tacks with the "points 'in opposite directions, means ffor reciprocating ithe punch, and mea ns :for' oscillating the punch betweenysnccessive -r'eciprocations whereby the punch Wil-l form' successive slug s, the points of Which -alternate in direction and Will deliver "said slugs to'the tack forming scribed and in conibination a die formed in two parts longitudinally of the tack to be formed, "said parts *together containing ja double ended matrix, means for reciprocating one part ofthematrix relativelytothe other, Iand'alternately acting head forming hammers onopposite sides of said die Whereby alternate 'ta'cks Will be formed W iththeir heads in opposite directions." 7 I V 11. In a machine of the character described strip feeding 'mechanism, 'a :reciproeating punch, a pair:of tack forming dies having a matrix for the formation of a tack, said tack forming dies being located in line 'With the'reciprocating punch, afinger -"reciprocating in line With the punch to assist the 'punch to deposit' the slug in the said dies, and a spring-finger in the face-of one'of'said dies to hold a slug cut by the punch in "proper .position' relatively to the other die.

In testimony whereof I affix my signature.

JAMES H. REED.

I 'Gopies of thispatentmay be obtained for'five ecnts each, by addressing the Commissioner's! ZP'ite'n ts,

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